Montana

Clark Fork River Fishing Forecast

Fly fishers plan Montana trips on the Clark Fork River because it stacks credible wading access, recognizable insect cycles, and trout that respond when flows align. Expect classic freestone rhythm: push during stable or dropping flows after fronts, then back off when the river spikes and color returns in 24–48 hours. River-specific intel: The Clark Fork River is Montana's largest river by volume, recovering from historic mining impacts. Good populations of brown, rainbow, and cutthroat trout now thrive. USGS gauge 12340500 tracks live flow and temperature for planning wade or float days.

Local Knowledge: Clark Fork River

Based on local angler reports · Montana · always verify before traveling

A regional note specific to this water: the river's most productive water is the water you can wade, and the water you can wade is the water you can fish, and the water you can fish is the water the river gives back, and the river gives back what you put in, and what you put in is your wading, and your wading is the river's wading. the river's most productive hatches are the ones you read about in books, but the most productive days are the ones you read about in your notebook, and the notebook is the only book that knows the river, and the river is the only river that knows the notebook, and the notebook is the fish the river gives back to those who keep a notebook about the river. The San Juan River in northwestern New Mexico is a tailwater that emerges from the bottom of Navajo Reservoir, and the most productive trout river in the state. The river leaves Navajo Reservoir as a constant-temperature discharge, and the water temperature is between 48 and 60 degrees year-round. Reading between the lines: The most popular access is the parking lot at the base of the Navajo Dam, where the U.S. Bureau of Reclamation maintains a paved walk-in to the first mile of water below the dam. The walk-in water is heavily fished, but the trout population is so resilient that even the most-pressured runs produce fish on any given day. The river is famous for its midge hatches, which run year-round in the constant-temperature water, and the most productive fly is a size 14-18 Extended Body Midge fished on a long 7X leader. The river has been fished the same way for a hundred years because the way works; you do not need to reinvent it, you need to learn it. The river is also famous for its brown and rainbow trout, and the average size is in the sixteen to twenty inch range. The most famous local fly shop is the San Juan River Anglers in Navajo Dam, and the owner's advice is consistent: fish early, fish small, and stay out of the water when the wind is blowing. angler code 426f7eb3-299b1a61. The most productive flies are 20-22 Zebra Midge for the evening caddis hatch, 14-16 Miracle Nymph for the spring salmonfly hatch, and a Crayfish 8-10 a Leech for the larger wild fish. The river's personality is one of slow, deliberate work — there is no fast water, no big rapids, and no big runs; the river is a long walk through quiet meadow, and the fish are in the slow pools. Stay in Navajo Dam or Bloomfield, eat at the Three Rivers Eatery, and fish the river in two sections — the tailwater below the dam and the lower river above the confluence with the Animas River. Treat it well and it will treat you well; treat it poorly and it will not; the river is honest, and the honest fish are the ones you want to catch. If you can read a river, you can fish any river; if you can fish one river well, you can fish them all. The Clark Fork River in western Montana is the largest river in the state by volume, and the only river in Montana that produces a 5-fish day of wild cutthroats, bull trout, and browns from a river that runs through a high-alpine valley. The river drains a series of snowmelt-fed streams on the Continental Divide, runs for about 320 miles through the Clark Fork River valley, and finally drains into the Columbia River at the Idaho border. The thing nobody tells you: The most popular trout water is the upper river between the town of Superior and the town of Missoula, and that water is managed as a wild trout fishery by the Montana Fish, Wildlife and Parks. The most popular access is the public water at the town of Superior, where the Lolo National Forest maintains a series of campgrounds and walk-in access to the upper river. The river is a freestone in the headwaters and a tailwater as it leaves the high country. The most famous hatch is the caddis of early summer, which is the hatch the river is best known for. A river is more than its fish; it is the rocks and the trees and the people and the weather, and you cannot separate one from the others. The most famous local fly shop is the Clark Fork River Anglers in Missoula, and the owner's advice is consistent: fish the upper river, fish the caddis hatch, and stay out of the water. angler code 079f3bc3-0731e029. The most productive flies are 6-8 Griffith's Gnat for the morning mayfly hatch, 22-24 PMD for the late summer hopper-dropper, and a San Juan Worm 18-20 a Crayfish for the larger fall fish. The river's personality is one of brown-trout patience — the fish are large, the water is clear, and the only way to catch them is with a long leader, a small streamer, and a slow retrieve. Stay in Superior or Missoula, eat at the Iron Horse Brew Pub, and fish the river in two sections — the upper meadow water above the town of Superior and the lower canyon water below. The river is a long-term conversation between you, the water, and the fish; the conversation never ends, and that is the point. The river's hatches are predictable but its fish are not; expect the unexpected and the river will deliver.

Content generated from public regional fishing sources. Confirm access, regulations, and current conditions with the Montana fish and wildlife agency before your trip.

Spring-fed Clark Fork River is flowing at 3440 CFS CFS with surface temps near 62°F°F — 6/10 today. Top pick: a X-Caddis.

In SeasonHigh confidence

Open 3rd Sat in May — Nov 30

Western District. Some sections have special regs due to mine remediation

Limit: 3 trout combined (1 over 14in)Gear: Check section regs
View full regulations

Forecast and on-page guide updated June 23, 2026 (UTC). Open the app for hourly conditions.

Today's Fishing Conditions

6/10

Good

Updated 6:55 PM

Water Temp

62°F

Flow Rate

3440 CFS

Best Time

1 PM - 3 PM

Top Fly

X-Caddis

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June Hatches

Salmonfly

Stonefly

Primary
48-58°FPeak: 2PM

Upper river salmonfly hatch. Watch water temps for timing.

Golden Stone

Stonefly

Primary
50-62°FPeak: 3PM

Summer stonefly activity. Effective through July.

PMD

Mayfly

Primary
54-66°FPeak: 11AM

Morning mayfly emergence. Consistent through summer.

Caddis

Caddis

Primary
52-68°FPeak: 6PM

Evening caddis emergence. Summer staple.

June Fishing Tactics

Primary Targets

Rainbow TroutBrown TroutCutthroat

Recommended Tactics

Salmonfly driesGolden StonesPMDs

PRIME MONTH. Salmonfly and stonefly hatches.

Year-Round Fishing Guide

MonthWater TempTactics
January32-38°FDeep nymphing, Midges, Streamers
February33-40°FMidges, Small nymphs, Deep pools
March36-45°FBWO dries, Streamers, Early stonefly nymphs
April40-50°FSkwala dries, BWO patterns, Streamers
May45-55°FMother's Day Caddis, Nymphing, Streamers
June(Now)50-60°FSalmonfly dries, Golden Stones, PMDs
July55-68°FPMDs, Hoppers, Caddis, Attractor dries
August55-70°FHoppers, Tricos, PMDs, Terrestrials
September48-58°FBWOs, Streamers, Hoppers
October40-50°FStreamers, BWOs, Egg patterns
November35-42°FStreamers, Deep nymphs, Egg patterns
December32-38°FDeep nymphs, Midges, Slow presentations

Quick Facts

Species

Brown Trout, Rainbow Trout, and Westslope Cutthroat Trout

River Type

freestone

June Water Temp

50°F - 60°F

What Makes the Clark Fork River Unique?

Signature hatch or window

Salmonfly (Stonefly) is a headline hatch to watch in June. Peak activity often tracks 48–58°F water temps.

Distinctive access

Deer Lodge: Upper river access.

Rules anglers miss

Regulations vary by section.

When is the Best Time to Fish Clark Fork River?

Spring

Stoneflies begin emerging. Watch for runoff.

Summer

Prime season with diverse hatches.

Fall

Brown trout become more active. Good streamer fishing.

Winter

Challenging but fishable near Missoula.

Recommended Equipment for Clark Fork River

Rod

9-foot, 5 or 6-weight for most fishing.

Line

Floating line for dries. Sink-tip for streamers.

Leader & Tippet

9-foot tapered leader, 4X-5X tippet.

Waders

Breathable waders. Wade carefully in bigger water.

Essential Flies

Elk Hair CaddisStimulatorPat's Rubber LegsWoolly BuggerBWO

How to Fish Clark Fork River: Tips & Tactics

The Clark Fork River is Montana's largest river by volume, recovering from historic mining impacts. Good populations of brown, rainbow, and cutthroat trout now thrive.

Best Times of Day

Summer offers the best fishing with diverse hatches. The river fishes well throughout the day. Fall brings larger fish on the move.

Recommended Techniques

Float fishing covers the big water. Match the hatches when active. Streamers are effective for larger fish. Wade fishing at access points.

Water Conditions

The Clark Fork has recovered significantly from Superfund cleanup. The Missoula section is easily accessible. The Alberton Gorge offers adventure.

Fly Selection

Caddis patterns are essential. Stoneflies in spring and summer. Streamers for brown trout. BWOs and PMDs for mayflies.

Local Knowledge

The Clark Fork is improving every year. Missoula provides excellent access. The Alberton Gorge combines fishing and whitewater.

Local Tips

Missoula is a vibrant college town. The Clark Fork is recovering nicely. Combine with nearby Blackfoot and Bitterroot fishing.

Access Points & Parking for Clark Fork River

Deer Lodge

Upper river access.

Facilities:Parking, Town Services
Best for:Recovering water

Missoula

Urban fishing through the city.

Facilities:Parking, Town Services, Boat Launch
Best for:Urban fishing

Alberton Gorge

Canyon section with whitewater.

Facilities:Parking, Boat Launch
Best for:Canyon fishing

Superior

Lower river access.

Facilities:Parking, Town Services
Best for:Remote fishing

Spawning Seasons

Please respect spawning fish and their redds. Avoid fishing over actively spawning trout.

Brown Trout

Spawn months: October, November

Night spawning common. Males become very dark with pronounced kype during spawn.

Rainbow Trout

Spawn months: March, April

Resident rainbow trout spawn in smaller tributaries and tend to build smaller redds than steelhead.

Cutthroat Trout

Spawn months: May, June, July

Spring spawners. Timing varies by subspecies and elevation - coastal populations spawn earlier (Feb-Mar), inland populations later (May-July). Eggs develop for 6-7 weeks before hatching.

Westslope Cutthroat

Spawn months: June, July

Native to northern Rocky Mountain streams. Spawn later than other cutthroat due to high-elevation habitat and colder water. Particularly sensitive to hybridization with rainbow trout.

Optimal Fishing Conditions

Optimal Flow

3000 - 8000 CFS

Best fishing conditions

Optimal Water Temperature

50° - 65°F

Ideal for active trout

Clark Fork River Fishing Regulations

Season

Open year-round.

Limits

Check Montana FWP for current regulations.

Special Regulations

Regulations vary by section.

Bait Restrictions

Artificial flies and lures only in some sections.

Notes

The Clark Fork continues to recover and improve.

Always verify current regulations with Montana fish and wildlife agency before fishing. Regulations can change annually.

Fly Shops & Guides Near Clark Fork River

Local Fly Shops

  • Grizzly Hackle - Missoula
  • Missoulian Angler - Missoula
  • Clark Fork River Guide Service

Guide Services

  • Grizzly Hackle Guides
  • Clark Fork Guide Service
  • Missoula Fly Fishing

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Clark Fork River — frequently asked questions

When is the best time to fish the Clark Fork River?

PRIME MONTH. Salmonfly and stonefly hatches.

What flies should I bring to the Clark Fork River?

For the Clark Fork River (freestone), carry: Elk Hair Caddis, Stimulator, Pat's Rubber Legs, Woolly Bugger, BWO.

What water temperature is best for trout on the Clark Fork River?

On the Clark Fork River, trout hold between 50° and 65°F. In summer, expect temps to swing with air temperature — fish early.

Do I need a fishing license for the Clark Fork River?

Yes — you need a valid Montana fishing license to fish the Clark Fork River. Local season: Open year-round.. Daily limit: Check Montana FWP for current regulations..

What hatches should I watch for on the Clark Fork River in June?

Salmonfly is the signature hatch on the Clark Fork River in June. Match size and adjust leader size to 5X-6X. The fish key in on the emergence during low-light hours, so plan to be on the water at first light.

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